JP2016111726A - Terminal connection part for aluminum conductor cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable terminal connection part for an aluminum conductor cable capable of firmly connecting an aluminum conductor and a conductor connection member by simple construction work.SOLUTION: The terminal connection part for the aluminum conductor cable comprises: the aluminum conductor; a cable insulator; a cable external semiconductive layer, the aluminum conductor cable of which the front end is stripped stepwise so as to expose a cable shielding layer; and the conductor connection member that is fitted to a front end of the aluminum conductor. The conductor connection member includes a serration on a contact surface in contact with the aluminum conductor, and antioxidant layer is interposed between the aluminum conductor and the conductor connection member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a terminal connecting portion of an aluminum conductor cable, and particularly to a connection structure between an aluminum conductor and a conductor connecting member.

  In general, in a terminal connection portion of a power cable, an internal conductor (conductor lead bar) and a cable conductor are electrically connected via a conductor connection terminal. Moreover, in the intermediate connection part of an electric power cable, cable conductors are electrically connected via a conductor connection pipe (sleeve). When the cable conductor is copper, the cable conductor and the conductor connection member (conductor connection terminal, conductor connection tube) can be easily connected, for example, by compression, and a good electrical connection is ensured.

  In recent years, power cables having aluminum conductors that are cheaper and lighter than copper conductors have been put into practical use (hereinafter referred to as “aluminum conductor cables”). Aluminum has a property that an oxide film is easily formed on the surface thereof as compared with copper. When the oxide film is interposed between the aluminum conductor and the conductor connecting member, the contact resistance increases, and therefore, in the cable terminal connecting portion such as the terminal connecting portion or the intermediate connecting portion, the conduction between the aluminum conductor and the conductor connecting member is ensured. Measures are needed.

  For example, in Patent Document 1, conduction is ensured by compressing and connecting an aluminum conductor and a conductor connecting member and tightening a bolt. Further, Patent Document 1 discloses a conductive antioxidant layer (compound layer) between an aluminum conductor and a conductor connecting member in order to prevent an oxide film from being formed over time on the surface of the aluminum conductor. It may be possible to intervene.

  When an antioxidant layer is interposed between the aluminum conductor and the conductor connecting member, it is preferable to apply a minimum amount of antioxidant so that the antioxidant layer is uniformly formed. However, since handling a small amount of antioxidant causes a reduction in work efficiency, the amount is usually applied so as to protrude from the end of the conductor connecting member after compression. Since the leaked antioxidant may deteriorate the insulation performance of the cable insulator of the aluminum conductor cable, it is wiped off with alcohol or the like.

JP 2014-167848 A JP 2014-164886 A

  However, depending on the level of skill of the operator, the amount of the antioxidant applied may increase so much that a large amount of the antioxidant protrudes from the end of the conductor connecting member. In this case, the subsequent wiping operation becomes very complicated. Further, when the aluminum conductor is compression-connected to the conductor connection member, it is necessary to increase the compression length from the viewpoint of securing mechanical strength and reducing the contact resistance as compared with the case where the copper conductor is compression-connected to the conductor connection member. For this reason, it is necessary to make the length of the conductor connection member longer than that of the power cable having a copper conductor, and thus it is necessary to lengthen the entire length of the cable terminal connection portion.

  On the other hand, in a crimp terminal for a small-diameter covered electric wire having an aluminum conductor, a wire terminal having an uneven shape called serration has been proposed on the inner surface of a wire barrel portion that holds a core wire portion (aluminum conductor). (For example, Patent Document 2). Since the edge of the serration bites into the core wire, the oxide film formed on the surface of the core wire is destroyed, so that good conduction can be easily obtained. Further, since the contact area between the core wire and the crimp terminal is increased, the crimp strength is improved.

  Even in the terminal connection part of a power cable having an aluminum conductor, by providing serrations on the conductor connection member instead of the conductive antioxidant layer (compound layer), the aluminum conductor can be formed more than when the antioxidant layer is provided. The mechanical strength when compression-connected to the conductor connection member is improved. Moreover, since the troublesome application | coating operation | work of antioxidant is eliminated, workability | operativity in the case of a compression operation improves. However, in this case, due to the problem of contact resistance between the aluminum conductor and the conductor connection member, it is necessary to increase the compression length as compared with the case where the copper conductor is compression-connected to the conductor connection member. For this reason, when the aluminum conductor of the power cable and the conductor connecting member are compression-connected, the effect of serration has been considered to be small.

  Thus, in the terminal connection part of an aluminum conductor cable (power cable having an aluminum conductor), it is necessary to make the conductor connection member longer than the terminal connection part of a copper conductor cable (power cable having a copper conductor). Therefore, it is necessary to lengthen the entire length of the terminal connection portion, and it has been desired to make the terminal connection portion of the aluminum conductor cable compact.

  The objective of this invention is providing the terminal connection part of the highly reliable aluminum conductor cable which can connect an aluminum conductor and a conductor connection member firmly by simple construction work.

The terminal connection part of the aluminum conductor cable according to the present invention includes an aluminum conductor cable, a cable insulator, a cable outer semiconductive layer, an aluminum conductor cable having a stepped end so as to expose the cable shielding layer,
A conductor connecting member attached to the tip of the aluminum conductor,
The conductor connecting member has serrations on a contact surface that contacts the aluminum conductor;
An antioxidant layer is interposed between the aluminum conductor and the conductor connecting member.

  ADVANTAGE OF THE INVENTION According to this invention, the terminal connection part of the highly reliable aluminum conductor cable which can connect an aluminum conductor and a conductor connection member firmly by simple construction work is implement | achieved.

It is a fragmentary sectional view which shows the air termination | terminus connection part of the aluminum conductor cable which concerns on 1st Embodiment. It is an enlarged view which shows the connection structure of an aluminum conductor and a conductor connection terminal. It is a fragmentary sectional view which shows the intermediate connection part of the aluminum conductor cable which concerns on 2nd Embodiment. It is an enlarged view which shows the connection structure of an aluminum conductor and a conductor connection pipe.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 is a partial cross-sectional view showing a terminal connection portion (in FIG. 1, an air terminal connection portion) of an aluminum conductor cable according to an embodiment of the present invention. FIG. 2 is an enlarged view showing a connection structure between the aluminum conductor 111 and the conductor connection terminal 121. As shown in FIGS. 1 and 2, the terminal connection portion 1 of the aluminum conductor cable 11 includes a cable end portion 1A and a polymer sleeve 1B to which the cable end portion 1A is attached. In the following, in the figure, the upper side is referred to as the front end side, and the lower side is referred to as the rear end side.

  As shown in FIG. 1, the polymer sleeve 1 </ b> B includes a rod-shaped inner conductor 13 (conductor lead bar) disposed at the center, an insulating cylinder 14 provided on the outer periphery of the inner conductor 13, and a polymer provided on the outer periphery of the insulating cylinder 14. The cover 15, the shielding metal 16 formed integrally with the insulating cylinder 14, the lower metal 17, and the bottom metal 19 are provided. The inner conductor 13, the insulating cylinder 14, the polymer cover 15, and the shielding metal fitting 16 are integrally formed by, for example, molding.

  The inner conductor 13 is made of a conductive material suitable for energization made of, for example, copper, aluminum, a copper alloy, or an aluminum alloy. The tip 131 of the internal conductor 13 is connected to an overhead wire, a lead-in wire (not shown), or the like. The rear end portion 132 of the inner conductor 13 is electrically connected to the conductor connection terminal 121 (conductor connection member).

  The insulating cylinder 14 is made of a hard plastic resin material (for example, epoxy resin or FRP (Fiber Reinforced Plastics)) having high mechanical strength. The cable terminal portion 1 </ b> A is attached to the receiving port of the rear end portion 141 of the insulating cylinder 14.

  The polymer covering 15 is made of a material having excellent electrical insulation performance (for example, a polymer material such as a silicone polymer). On the outer peripheral surface of the polymer cover 15, umbrella-shaped ridges are formed apart in the longitudinal direction.

  The shielding metal fitting 16 has a cylindrical portion embedded concentrically with the internal conductor 13 and a flange portion extending radially outward from the rear end of the cylindrical portion. The cylindrical portion has an electric field relaxation function and relaxes the electric field of the polymer sleeve 1B.

  The lower metal member 17 has a cylindrical shape having a flange portion (hereinafter referred to as “front end flange portion”) at the front end portion, and is disposed on the outer periphery of the rear end portion 141 of the insulating cylinder 14. The lower fitting 17 is fixed to the shielding fitting 16 by bolting the front end flange portion of the lower fitting 17 to the rear end surface of the flange portion of the shielding fitting 16 (not shown).

  The bottom metal fitting 19 is provided on the outer periphery of the front end flange portion of the lower metal fitting 17 and is bolted (not shown) to the rear end surface of the outer peripheral edge portion of the flange portion of the shielding metal fitting 16. The polymer sleeve 1B is fixed to the gantry R via the support lever 18 by fixing the support lever 18 to the rear end surface of the bottom metal fitting 19 with bolts.

  1 A of cable terminal parts have the aluminum conductor cable 11 and the connection component 12 attached to the front-end | tip part of the aluminum conductor cable 11. FIG. The connection component 12 includes a conductor connection terminal 121, a stress cone 122, a compression device (not shown), a protective metal fitting 123, an anticorrosion layer 124, and the like.

  The aluminum conductor cable 11 is a power cable (for example, a CV cable) insulated with rubber or plastic. The aluminum conductor cable 11 includes, in order from the inside, an aluminum conductor 111, an inner semiconductive layer (not shown), a cable insulator 112, an outer semiconductive layer (not shown), a cable shielding layer (not shown), a cable sheath 113, and the like. Have In the cable terminal portion 1 </ b> A, each layer is exposed by stripping a predetermined length from the tip of the aluminum conductor cable 11.

  A conductive conductor connection terminal 121 is connected to the aluminum conductor 111 by compression. A stress cone 122 in which an insulating rubber layer and a bell mouth shaped semiconductive rubber layer are integrally formed is attached to the outer periphery extending from the cable insulator 112 to the distal end side of the cable external semiconductive layer (not shown). A compression device (not shown) and a protective metal fitting 123 are attached to the rear end side of the stress cone 122, and an anticorrosion layer 124 for waterproofing is formed at the rear end portion of the protective metal fitting 123.

  The conductor connection terminal 121 includes a compression part 121a that is connected to the aluminum conductor 111 by compression, a current-carrying part 121b that is electrically connected to the internal conductor 13 via the plug 120, and a space between the compression part 121a and the current-carrying part 121b. And an annular recess 121c provided on the surface. An insertion hole 121f into which the aluminum conductor 111 is inserted is formed in the compression part 121a, the recessed part 121c, and the energization part 121b.

  The recessed portion 121c can absorb the elongation and deformation of the conductor connection terminal 121 when the conductor connection terminal 121 is compression-connected to the aluminum conductor 111. As a result, the spring-like contact 125 and the inner conductor 13 in the energization portion 121b can be absorbed. Effective electrical contact can be achieved. The plug 120 is disposed on the outer periphery of the conductor connection terminal 121 and is electrically connected to the rear end portion 132 of the inner conductor 13 by a conductor contact such as a multi-contact.

  The compression part 121a and the recessed part 121c are comprised with the 1st metal member, are the continuous structures provided in a row, and are comprised here with aluminum. The energizing portion 121b is made of a second metal member, here made of copper. The first metal member and the second metal member are joined by friction welding using frictional heat generated by relative movement in a contact-pressed state. As a result, the first metal member (aluminum) and the second metal member (copper) are connected to each other at the rear end portion of the energization portion 121b, so that the compression portion 121a, the recessed portion 121c, and the energization portion 121b are provided continuously. It becomes the integrated structure made.

  Friction welding is suitable for joining dissimilar metal materials such as copper and aluminum. That is, the joint part joined by friction welding has a dense structure due to the influence of frictional heat and pressure, and everything from the end part to the center part is joined, so the joint strength is very high. In addition, almost no intermetallic compound is formed, and there is no welding defect such as a blow hole (spherical cavity) generated by arc welding, so that the reliability is high.

  Serrations 121d are formed on the inner peripheral surface (contact surface with the aluminum conductor 111) of the compression portion 121a. The serration 121d is formed in a female screw shape, for example. The amount of the antioxidant applied to the inner peripheral surface of the conductor connection terminal 121 can be controlled by the shape of the serration 121d and the depth of the groove. The serration 121d is not limited to the female screw shape, but may be any uneven structure. The female screw shape is more preferable because it is easier to process than the complicated uneven structure and the cost of the conductor connection terminal 121 can be suppressed.

  A groove 121e for arranging the spring-like contactor 125 (multi-contact) is formed on the outer peripheral surface of the energization part 121b. Since the current-carrying part 121b is made of copper, a complicatedly shaped groove 121e for mounting the spring-like contactor 125 (multi-contact) can be easily formed.

  The cable terminal portion 1A is attached to the polymer sleeve 1B by a plug-in structure. The aluminum conductor 111 is electrically connected to the inner conductor 13 through the conductor connection terminal 121, the spring-like contact 125, and the plug 120.

  When the conductor connection terminal 121 is connected to the tip of the aluminum conductor 111, the oxide film formed on the surface of the aluminum conductor 111 is removed in advance with a wire brush. Further, a protective film is wound around the end surface of the cable insulator 112 (the boundary surface between the aluminum conductor 111 and the cable insulator 112) to protect the leaked antioxidant from adhering to the cable insulator 112.

  Next, a conductive antioxidant (anticorrosive compound) is applied to the outer peripheral surface of the aluminum conductor 111 and the inner peripheral surface of the conductor connection terminal 121. At this time, an antioxidant is applied so that the groove of the serration 121d is filled. Thereby, a predetermined amount (for example, 1 g) of antioxidant can be easily applied regardless of the skill level of the operator. In addition, by applying an antioxidant, the surface of the aluminum conductor 111 can be prevented from being oxidized, and has a function as a lubricant during a compression operation.

  Since the high-voltage power cable has a larger outer diameter than the low-voltage coated electric wire, it is different from the crimped connection of the conductor of the coated electric wire to the terminal using a crimping tool. Therefore, it is necessary to compressively connect the aluminum conductor 111 to the conductor connection terminal 121. After applying the antioxidant, with the tip of the aluminum conductor 111 inserted into the insertion hole 121f of the conductor connection terminal 121, the compression part 121a is directed toward the aluminum conductor 111 using a predetermined compression tool (for example, a hexagonal die). Press evenly and compress. As the serration 121d of the conductor connection terminal 121 bites into the aluminum conductor 111, a retaining effect is obtained. Therefore, the aluminum conductor 111 and the conductor connection terminal 121 are firmly connected.

  An antioxidant layer 126 is formed with a uniform thickness between the aluminum conductor 111 and the conductor connection terminal 121. Since the antioxidant layer 126 is interposed between the aluminum conductor 111 and the conductor connection terminal 121, it is possible to prevent the oxide film from being regenerated on the surface of the aluminum conductor 111, thereby ensuring good conduction.

  Then, the antioxidant leaking from the rear end portion of the conductor connection terminal 121 is wiped off with alcohol or the like. Further, a protective tape 127 (for example, a cellbon tape or the like) is wound around the rear end portion of the conductor connection terminal 121 to prevent further leakage of the antioxidant. Since the application amount of the antioxidant is appropriately controlled by the serration 121d, a large amount of the antioxidant does not protrude. Therefore, the leaked antioxidant can be easily wiped off. The leaked antioxidant does not adhere to the cable insulator 112 and the insulation performance of the cable insulator 112 is not deteriorated.

In addition, according to the present embodiment, the length of the conductor connection terminal 121 that has conventionally been necessary for connecting the aluminum conductor 111 to the conductor connection terminal 121 is, for example, about 40 to 50% in the case of a conductor cross-sectional area of 500 mm ^2. The length of the conductor connection terminal 121 can be shortened (that is, about 50 to 60% of the conventional length can be realized), and the length of the conductor connection terminal 121 can be shortened to the same extent as when the copper conductor is connected to the conductor connection terminal. . Therefore, the terminal connection part of the aluminum conductor cable of a comparable magnitude | size can be provided compared with the terminal connection part of a copper conductor cable.

  As described above, the terminal connection portion 1 (the terminal connection portion of the aluminum conductor cable) exposes the aluminum conductor 111, the cable insulator 112, the cable outer semiconductive layer (not shown), and the cable shielding layer (not shown). An aluminum conductor cable 11 having a stepped end, and a conductor connecting terminal 121 (conductor connecting member) attached to the tip of the aluminum conductor 111 are provided. The conductor connection terminal 121 has a serration 121d on a contact surface that contacts the aluminum conductor 111, and an antioxidant layer 126 is interposed between the aluminum conductor 111 and the conductor connection terminal 121 (conductor connection member).

  According to the termination connection part 1 (terminal connection part of the aluminum conductor cable), the application amount of the antioxidant is appropriately controlled by the serrations 121d formed on the conductor connection terminal 121 (conductor connection member). Can prevent the antioxidant from leaking out. Thereby, a predetermined amount (for example, 1 g) of antioxidant can be easily applied regardless of the skill level of the operator. Moreover, since the leaked antioxidant can be easily wiped off, it is possible to prevent the insulation performance of the cable insulator 112 from deteriorating due to the attachment of the antioxidant. Further, the serration 121d improves the connection strength and ensures good conduction. Therefore, the aluminum conductor 111 and the conductor connection terminal 121 (conductor connection member) can be firmly connected by a simple construction work, and the terminal connection portion of the aluminum conductor cable (the end of the aluminum conductor cable) is compact and highly reliable. Connecting portion) is realized.

[Second Embodiment]
FIG. 3 is a partial cross-sectional view showing the intermediate connection portion 2 of the aluminum conductor cable according to the embodiment of the present invention. FIG. 4 is an enlarged view showing a connection structure between the aluminum conductors 211 and 221 and the conductor connection pipe 23. As shown in FIGS. 3 and 4, the intermediate connection portion 2 of the aluminum conductor cable includes a cable end portion 2A, a reinforcing insulating portion 2B surrounding the cable end portion 2A, and a protective case 2C.

  The cable terminal portion 2 </ b> A includes a first aluminum conductor cable 21, a second aluminum conductor cable 22, and a conductor connection tube 23. Hereinafter, when the first aluminum conductor cable 21 and the second aluminum conductor cable 22 are not distinguished from each other, they are simply referred to as “aluminum conductor cables 21 and 22”.

  The aluminum conductor cables 21 and 22 are power cables (for example, CV cables) insulated with rubber or plastic. The aluminum conductor cables 21 and 22 are, in order from the inside, aluminum conductors 211 and 221, inner semiconductive layers (not shown), cable insulators 212 and 222, cable outer semiconductive layers 213 and 223, cable shielding layers 214, 224, cable sheaths 215, 225 and the like.

  In the cable end portion 2A, the end portions of the aluminum conductor cables 21 and 22 are stepped off at a predetermined length, so that each layer is exposed. A conductive conductor connection tube 23 is compression-connected to each of the aluminum conductors 211 and 221. The aluminum conductors 211 and 221 are electrically connected to the internal electrode 24 via the conductor connection tube 23 and a semiconductive tape (not shown). The semiconductive tape is wound so as to fill a gap between the outer periphery of the conductor connection tube 23 and the internal electrode 24, and is provided so that the outer periphery of the semiconductive tape is in contact with the inner surface of the internal electrode 24.

  The conductor connection tube 23 is made of aluminum, and has a serration 23a on the inner peripheral surface (contact surface with the aluminum conductors 211 and 221), similarly to the conductor connection terminal 121 in the first embodiment. The serrations 23a are formed on both sides in the longitudinal direction of the conductor connection tube 23 by, for example, a female screw shape. The amount of the antioxidant applied to the inner peripheral surface of the conductor connecting pipe 23 can be controlled by the shape of the serration 23a and the depth of the groove. The serrations 23a are not limited to the female screw shape, and may be any uneven structure. In the case of a female screw shape, processing is simpler than a complicated uneven structure, and the cost of the conductor connecting pipe 23 can be suppressed, which is more preferable.

  When connecting the conductor connection tube 23 to the tip end portions of the aluminum conductors 211 and 221, the oxide film formed on the surfaces of the aluminum conductors 211 and 221 is previously removed with a wire brush. Further, a leaking antioxidant is wound around each end face of the cable insulators 212 and 222 (a boundary surface between the aluminum conductor 211 and the cable insulator 212 and a boundary surface between the aluminum conductor 221 and the cable insulator 222). Protects the cable insulation 212, 222 from sticking.

  Next, a conductive antioxidant (anticorrosive compound) is applied to the outer peripheral surfaces of the aluminum conductors 211 and 221 and the inner peripheral surface of the conductor connection tube 23. At this time, an antioxidant is applied so that the grooves of the serrations 23a are filled. Thereby, an appropriate amount (for example, 1 g) of an antioxidant can be easily applied regardless of the skill level of the operator. In addition, by applying an antioxidant, the surface of the aluminum conductor 211 can be prevented from being oxidized, and has a function as a lubricant during a compression operation.

  Since the high-voltage power cable has a larger outer diameter than the low-voltage coated electric wire, a hexagonal die or the like is used instead of crimping the conductor of the coated electric wire to the connection pipe (sleeve) using a crimping tool. It is necessary to compress and connect the aluminum conductor 211 to the conductor connection pipe 23 by using a compression device. After applying the antioxidant, with the tips of the aluminum conductors 211 and 221 inserted into the conductor connection tube 23, apply evenly toward the aluminum conductors 211 and 221 using a predetermined compression tool (for example, a hexagonal die). Press and compress. As the serration 23a of the conductor connection tube 23 bites into the aluminum conductors 211 and 221, a retaining effect is obtained. Therefore, the aluminum conductors 211 and 221 and the conductor connecting pipe 23 are firmly connected and good conduction is obtained.

  After the compression, the antioxidant layer 31 is formed between the aluminum conductors 211 and 221 and the conductor connecting pipe 23 with a uniform thickness. Since the antioxidant layer 31 is interposed between the aluminum conductors 211 and 221 and the conductor connecting pipe 23, it is possible to prevent the oxide film from being regenerated on the surfaces of the aluminum conductors 211 and 221. Secured.

  Then, the antioxidant leaking from both ends of the conductor connection tube 23 is wiped off with alcohol or the like. 3 is an embodiment of the rubber block joint (RBJ), the semiconductive tape (not shown) is wound around both ends of the conductor connecting tube 23 so that the semiconductive tape is attached. It acts as a protective tape and prevents further leakage of the antioxidant. Since the application amount of the antioxidant is appropriately controlled by the serration 23a, a large amount of the antioxidant does not leak out. Therefore, the leaked antioxidant can be easily wiped off. The leaked antioxidant does not adhere to the cable insulators 212 and 222, and the insulation performance of the cable insulators 212 and 222 is not deteriorated.

In addition, according to the present embodiment, the length of the conductor connection tube 23 that has been conventionally required for connecting the aluminum conductor 211 to the conductor connection tube 23 is, for example, 40 to 50% in the case of a conductor cross-sectional area of 500 mm ^2. The length of the conductor connection tube 23 can be shortened to the same extent as when the copper conductor is connected to the conductor connection tube (sleeve). can do. Therefore, the terminal connection part of the aluminum conductor cable of a comparable magnitude | size can be provided compared with the terminal connection part of a copper conductor cable.

  The reinforcing insulating portion 2B is a one-piece rubber block insulator in which the internal electrode 24, the rubber insulating portion 25, the stress cone portions 26 and 27, and the external shielding layer 28 are integrally formed. The rubber insulating portion 25 has a cylindrical shape and is made of an elastic material such as silicone rubber. The reinforcing insulating portion 2B is not limited to silicone rubber, and may be formed of ethylene propylene rubber (EP rubber).

  The internal electrode 24 is made of, for example, semiconductive silicone rubber, and is disposed on the inner peripheral surface of the central portion in the longitudinal direction of the rubber insulating portion 25. The internal electrode 24 is electrically connected to the conductor connection tube 23 via the above-described semiconductive tape. The conduction between the internal electrode 24 and the conductor connection tube 23 may be electrically connected by winding a semiconductive tape around the outer periphery of the conductor connection tube 23 and bringing the semiconductive tape and the internal electrode 24 into contact with each other. The internal electrode 21 and the conductor connection tube 23 may be configured to be in direct contact with each other, or may be electrically connected, or a conductive rubber having a cylindrical shape with a cut in the longitudinal direction is wound around the outer periphery of the conductor connection tube 23. The conductive rubber and the internal electrode 24 may be brought into contact with each other to be electrically connected. When a semiconductive tape is wound and formed, the semiconductive tape can also serve as a protective tape for preventing further leakage of the antioxidant, which is more desirable from the viewpoint of reducing the number of parts.

  The stress cone portions 26 and 27 are formed of a cylindrical body having a bell mouth shape, and are made of, for example, semiconductive silicone rubber. The stress cone portion 26 extends from the cable insulator 212 of the first power cable 21 to the cable external semiconductive layer 213 (including the case where the end portion is reprocessed with a semiconductive tape or conductive paint after stripping). The end portion is formed to extend outward from the one end portion (the left end portion in FIG. 3) of the rubber insulating portion 25. The stress cone portion 27 extends from the cable insulator 222 of the second power cable 22 to the cable outer semiconductive layer 223 (including the case where the end portion is reprocessed with a semiconductive tape or conductive paint after stripping). The end portion is formed to extend outward from the other end portion of the rubber insulating portion 25 (the right end portion in FIG. 3).

  The outer shielding layer 28 has a cylindrical shape and is made of, for example, semiconductive silicone rubber. The outer shielding layer 28 is disposed on the outer peripheral surface of the rubber insulating portion 25, and is at least the end portion of the stress cone portions 26 and 27 on the center side of the connection portion (the inner diameter of the stress cone portions 26 and 27 is increased). It is formed longer than the length between the end portions). The external shielding layer 28 may be formed of a conductive paint such as a semiconductive paint.

  In the reinforcing insulating portion 2B of the present embodiment, the external shielding layer 28 does not contact one (left side in FIG. 3) stress cone portion 26, and the other (right side in FIG. 3) stress cone portion 27 Although it is a single edge cutting structure that contacts, either a double edge cutting structure where the external shielding layer 28 does not contact the stress cone portions 26, 27 or a non-edge cutting structure where the external shielding layer 28 contacts both the stress cone portions 26, 27. May be.

  The inner peripheral surfaces of the internal electrode 24, the rubber insulating portion 25, and the stress cone portions 26 and 27 are formed flush with each other. The internal electrode 24, the stress cone portions 26 and 27, and the external shielding layer 28 (in the case of molding) are preferably formed of the same material (semiconductive silicone rubber) in terms of molding. The rubber insulating portion 25 is also preferably formed of an insulating material that does not have the same type of conductivity as these (for example, insulating silicone rubber).

  The reinforcing insulating portion 2B is held in a state where the diameter is expanded by a diameter expanding member such as a spiral core in a factory, for example. The reinforcing insulating portion 2B is disposed so as to surround the cable terminal portion 2A at the construction site, and then attached to the cable terminal portion 2A in close contact with the self-shrinking force of rubber by pulling out the diameter-expanding member. . Thereby, the insulation performance in the intermediate connection part 2 is ensured. The reinforcing insulating portion 2B is not limited to a so-called factory expansion type such as a spiral core, but may be a so-called local expansion type that expands the diameter at a construction site using a diameter expansion jig or a diameter expansion device.

  The protective case 2 </ b> C is a double-structured protective case having an inner protective tube 29 and an outer protective tube 30. A waterproof mixture (for example, a waterproof compound such as urethane) is filled between the cable terminal portion 2A and the protective case 2C and between the inner protective tube 29 and the outer protective tube 30. By the protective case 2C and the waterproof mixture, the water shielding property of the intermediate connection portion 2 of the aluminum conductor cable is ensured. The cable shielding layers 214 and 224 are grounded through the inner protective tube 29 and the outer protective tube 30.

  Thus, the intermediate connection part 2 (terminal connection part of the aluminum conductor cable) exposes the aluminum conductors 211 and 221, the cable insulators 212 and 222, the cable outer semiconductive layers 213 and 223, and the cable shielding layers 214 and 224. As described above, the aluminum conductor cables 21 and 22 having the stepped end portions and the conductor connecting pipes 23 (conductor connecting members) attached to the tip portions of the aluminum conductors 211 and 221 are provided. The conductor connection pipe 23 has serrations 23 a on contact surfaces that come into contact with the aluminum conductors 211 and 221, and an antioxidant layer 31 is interposed between the aluminum conductors 211 and 221 and the conductor connection pipe 23.

  According to the intermediate connection part 2 (terminal connection part of the aluminum conductor cable), the application amount of the antioxidant is appropriately controlled by the serrations 23a formed on the conductor connection pipe 23 (conductor connection member). Can prevent the antioxidant from leaking out. Thereby, a predetermined amount (for example, 1 g) of antioxidant can be easily applied regardless of the skill level of the operator. Further, since the leaked antioxidant can be easily wiped off, it is possible to prevent the insulation performance of the cable insulators 212 and 222 from deteriorating due to the attachment of the antioxidant. Further, the serration 23a improves the connection strength and ensures good conduction. Therefore, the aluminum conductors 211 and 221 and the conductor connection pipe 23 (conductor connection member) can be firmly connected by a simple construction work, and the intermediate connection portion (aluminum conductor cable) of the compact and highly reliable aluminum conductor cable can be obtained. Terminal connection unit) is realized.

As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and can be changed without departing from the gist thereof.
For example, in the terminal connection part 1 of the first embodiment, the case of the air terminal connection part using a polymer sleeve has been described, but the air terminal having an internal conductor using a composite steel pipe or a ceramic steel pipe. You may apply to a connection part. Moreover, you may apply to the termination | terminus part in gas termination | terminus using an epoxy bushing which has an internal conductor instead of an termination | terminus part in air, and termination | terminus connection part in oil. Furthermore, you may apply to a prefabricated joint (PJ), a Y branch joint (YJ), etc. In this case, an electrode that conducts each cable conductor embedded in the epoxy body of PJ or YJ is an internal conductor.

  In the intermediate connection portion 2 of the second embodiment, the case of the rubber block joint (RBJ) has been described. However, the tape-molded connection portion (TMJ), the extrusion mold connection portion (EMJ), and the block mold connection portion. (BMJ) You may apply to any.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 Terminal connection (terminal connection)
DESCRIPTION OF SYMBOLS 1A Cable terminal part 11 Aluminum conductor cable 111 Aluminum conductor 112 Cable insulator 113 Cable sheath 12 Connection component 121 Conductor connection terminal (conductor connection member)
126 Antioxidant Layer 1B Polymer Sleeve 13 Inner Conductor 14 Insulating Cylinder 15 Polymer Cover 16 Shielding Bracket 17 Lower Bracket 18 Supporting Insulator 19 Bottom Bracket 2 Intermediate Connection Portion (Terminal Connection Portion)
2A Cable terminal portion 21, 22 Aluminum conductor cable 211, 221 Aluminum conductor 212, 222 Cable insulator 213, 223 External semiconductive layer 214, 224 Cable shielding layer 215, 225 Cable sheath 23 Conductor connection pipe (conductor connection member)
2B Reinforcement insulation part 24 Internal electrode 25 Rubber insulation part 26, 27 Stress cone part 28 External shielding layer 29 Inner protection tube 30 Outer protection tube 31 Antioxidant layer

Claims (7)

An aluminum conductor cable having a stepped end so as to expose an aluminum conductor, a cable insulator, a cable outer semiconductive layer, and a cable shielding layer;
A conductor connecting member attached to the tip of the aluminum conductor,
The conductor connecting member has serrations on a contact surface that contacts the aluminum conductor;
An end connecting portion of an aluminum conductor cable, wherein an antioxidant layer is interposed between the aluminum conductor and the conductor connecting member. The conductor connection member has a compression portion for compressing and connecting the aluminum conductor,
The terminal connection part of the aluminum conductor cable according to claim 1, wherein the serration is provided on an inner peripheral surface of the compression part.   The terminal connection part of the aluminum conductor cable according to claim 1, wherein a protective tape is provided between the conductor connection member and the cable insulator.   The terminal connection part of the aluminum conductor cable according to any one of claims 1 to 3, wherein the serration is formed in a female screw shape.   The terminal connection part of the aluminum conductor cable according to any one of claims 1 to 4, wherein the conductor connection member is made of aluminum. An inner conductor electrically connected to the aluminum conductor;
The said conductor connection member is a conductor connection terminal for compressively connecting the said aluminum conductor of the said one aluminum conductor cable, The aluminum conductor cable of any one of Claim 1 to 5 characterized by the above-mentioned. Terminal connection.   The aluminum conductor cable according to any one of claims 1 to 5, wherein the conductor connection member is a conductor connection pipe for compressively connecting the aluminum conductors of the two aluminum conductor cables. Terminal connection.

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